lib: Move hashtable from lib to unicast

The hashtable is only used for forwarding tables in the unicast
IPCP. This moves the generic hashtable out of the library into the
unicast IPCP to prepare a more tailored implementation specific to
routing tables containing address lists.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 55 insertions, 0 deletions

diff --git a/src/ipcpd/unicast/pol/hashtable.h b/src/ipcpd/unicast/pol/hashtable.h
new file mode 100644
index 00000000..b6a36180
--- /dev/null
+++ b/src/ipcpd/unicast/pol/hashtable.h
@@ -0,0 +1,55 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2020
+ *
+* Hash table with integer keys with separate chaining on collisions
+  *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., http://www.fsf.org/about/contact/.
+ */
+
+#ifndef OUROBOROS_HASHTABLE_H
+#define OUROBOROS_HASHTABLE_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+struct htable;
+
+/* Buckets is rounded up to the nearest power of 2 */
+struct htable * htable_create(uint64_t buckets,
+                              bool     hash_key);
+
+void            htable_destroy(struct htable * table);
+
+void            htable_flush(struct htable * table);
+
+/* Passes ownership of the block of memory */
+int             htable_insert(struct htable * table,
+                              uint64_t        key,
+                              void *          val,
+                              size_t          len);
+
+/* The block of memory returned is no copy */
+int             htable_lookup(struct htable * table,
+                              uint64_t        key,
+                              void **         val,
+                              size_t *        len);
+
+int             htable_delete(struct htable * table,
+                              uint64_t        key);
+
+#endif /* OUROBOROS_HASHTABLE_H */